A high-energy, brilliantly silly, fully illustrated festive adventure story by much-loved actor Stephen Mangan and talented artist Anita Mangan. Barrie is a St Bernard dog who much prefers snoozing and farting in front of a cosy fire than going on daring rescue missions through high winds, driving snow and avalanches. On Christmas Eve, his humans Carrie and Laurence find a top-secret network of underground tunnels accessed by climbing into postboxes - and there's an extra special twist! The tunnels are designed for squirrels to transport presents from Father Christmas' workshop in the North Pole to all the children of the world.

When a mysterious elf seems set on sabotaging the tunnels, the kids and Barrie must stop him and SAVE CHRISTMAS!